What's in the bottle? (Example 2)

Here is another example
of manufacturers packaging different stuff in
nearly identical bottles. The example shows
two bottles containing different doses of insulin
for treating diabetes.
In this case, the
consequences of choosing the wrong bottle are
much more serious. You could end up in the hospital.

The bottle on the left contains
Insulin R (for Regular Insulin).
Regular Insulin acts relatively fast
(over a 4 to 6 hour period) and is
generally meant to be taken before a meal.
The bottle on the right
contains Insulin N (for NPH Insulin).
NPH Insulin acts over a broader
span of time and more slowly
(e.g., a 12 to 18 hour period) and is meant
to be taken generally once or twice during a
24 hour period to keep a
diabetics' blood glucose from rising significantly.

Many diabetics use
R (regular) insulin in conjunction with N or
some other long-acting
insulin. The consequences of accidently taking
Insulin R instead of
Insulin N at bedtime would be serious because you
could end up having a
hypoglycemic reaction during the middle of the night
(i.e., extremely
low blood glucose levels). Thus, choosing the
wrong insulin could be a
very serious and possibly deadly mistake.

You would think that the manufacturers
would make the two different kinds of insulin
bottles a bit more distinguishable than simply
differing by one character and one small symbol.
This is particularly true for diabetics since
some of the common side-effects of diabetes are
are vision problems.
For a similar bad design example see:
What's in the bottle? (Example 1)

Design suggestion

Things
that need to be distinguished from each other
should differ by more than just a single feature.
For example, the bottles could have different
shapes and sizes to make them more distinguishable.